2156563512 has 24 divisors (see below), whose sum is σ = 5840693040. Its totient is φ = 718854480.

The previous prime is 2156563501. The next prime is 2156563523. The reversal of 2156563512 is 2153656512.

2156563512 is a `hidden beast` number, since 2 + 1 + 5 + 6 + 5 + 635 + 12 = 666.

It is an interprime number because it is at equal distance from previous prime (2156563501) and next prime (2156563523).

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14976064 + ... + 14976207.

It is an arithmetic number, because the mean of its divisors is an integer number (243362210).

Almost surely, 2^2156563512 is an apocalyptic number.

It is an amenable number.

2156563512 is an abundant number, since it is smaller than the sum of its proper divisors (3684129528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156563512 is a wasteful number, since it uses less digits than its factorization.

2156563512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29952283 (or 29952276 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 2156563512 is about 46438.8147135562. The cubic root of 2156563512 is about 1291.9749233919.

The spelling of 2156563512 in words is "two billion, one hundred fifty-six million, five hundred sixty-three thousand, five hundred twelve".